<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
<style>
    body{
        background:url(i/bg_flower.gif);
        background-size:63px 100px;
        -moz-background-size:63px 100px; /* 老版本的Firefox */
        background-repeat:no-repeat;
        padding-top:80px;
    }
</style>

</head>
<body>
<p>上面是缩小的背景图片</p>

<p>原始图片：<img src="i/bg_flower.gif" alt="Flowers"></p>
</body>
</html>